CN114352289A - Air shaft duct and method for breaking shield tunnel segment in mine construction section - Google Patents
Air shaft duct and method for breaking shield tunnel segment in mine construction section Download PDFInfo
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- CN114352289A CN114352289A CN202210005195.3A CN202210005195A CN114352289A CN 114352289 A CN114352289 A CN 114352289A CN 202210005195 A CN202210005195 A CN 202210005195A CN 114352289 A CN114352289 A CN 114352289A
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- 238000000034 method Methods 0.000 title claims abstract description 61
- 238000010276 construction Methods 0.000 title claims description 64
- 229910000831 Steel Inorganic materials 0.000 claims description 92
- 239000010959 steel Substances 0.000 claims description 92
- 239000002689 soil Substances 0.000 claims description 17
- 230000002787 reinforcement Effects 0.000 claims description 14
- 238000009412 basement excavation Methods 0.000 claims description 13
- 239000011440 grout Substances 0.000 claims description 12
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 9
- 239000004567 concrete Substances 0.000 claims description 9
- 238000005520 cutting process Methods 0.000 claims description 9
- 230000002093 peripheral effect Effects 0.000 claims description 9
- 238000007789 sealing Methods 0.000 claims description 7
- 239000000758 substrate Substances 0.000 claims description 7
- 238000009415 formwork Methods 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- 230000003014 reinforcing effect Effects 0.000 claims description 6
- 239000002002 slurry Substances 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 238000007569 slipcasting Methods 0.000 claims description 4
- 239000004568 cement Substances 0.000 claims description 3
- 238000009792 diffusion process Methods 0.000 claims description 3
- 238000005553 drilling Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 238000005192 partition Methods 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
- 239000011378 shotcrete Substances 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 230000000903 blocking effect Effects 0.000 claims description 2
- 238000004891 communication Methods 0.000 claims description 2
- 238000004080 punching Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 3
- 238000003466 welding Methods 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- 229910000746 Structural steel Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/003—Linings or provisions thereon, specially adapted for traffic tunnels, e.g. with built-in cleaning devices
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
- E21D11/105—Transport or application of concrete specially adapted for the lining of tunnels or galleries ; Backfilling the space between main building element and the surrounding rock, e.g. with concrete
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/38—Waterproofing; Heat insulating; Soundproofing; Electric insulating
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F1/00—Ventilation of mines or tunnels; Distribution of ventilating currents
- E21F1/003—Ventilation of traffic tunnels
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Abstract
A method for breaking the segment of shield tunnel includes excavating air channel transversely at one side of shield tunnel; excavating air ducts of the air shaft in sequence by layering and segmenting according to the serial numbers of pilot tunnels by using a step method, and constructing primary support; the upper pilot tunnel is constructed above the top of the tunnel, transversely spans the existing tunnel, and is excavated to a first air shaft air duct end wall A for plugging, the lower pilot tunnel is constructed below the top of the tunnel, and is transversely excavated to a second air shaft air duct end wall B for plugging close to the outer edge of the shield tunnel; constructing a waterproof layer and a secondary lining structure of an air duct of the air shaft; excavate No. 1 and No. 2 shaft respectively at two tunnel sides in air shaft wind channel: removing shield segments in the air duct of the air shaft; and the end wall II B and the primary support of the side wall of the vertical shaft are gradually broken along with the breaking of the left tunnel pipe sheet, and the tunnel is communicated with the air duct of the air shaft, the vertical shaft No. 1 and the vertical shaft No. 2. The shield is enabled to pass through in advance and then tunnel segments are broken, and the method is suitable for projects which need temporary air shafts such as station adding and station reducing projects.
Description
Technical Field
The invention relates to the technical field of subway engineering construction, in particular to an air shaft air duct and a method for breaking a shield tunnel segment mine construction interval.
Background
Subway construction is used as a large long-distance linear engineering project, the construction period risk is gradually prominent in recent years, and particularly, in recent years, many long-distance interval tunnels appear in the construction of long and large express lines. In order to meet the needs of subway operation and evacuation, interval air shafts are often added to long-distance tunnels, if the interval air shafts are constructed and then shield tunneling is carried out, the delay of the construction period of the interval air shafts often influences subsequent shield construction, and the total construction period is prolonged.
In addition, similar situations also exist in subway stations, a common subway is located in a region with bustling commercial and heavy ground traffic, the construction period is greatly limited by the removal progress, and after a tunnel is opened, the problems of station adding, station reducing, station slow building and the like are frequently solved in the later period.
Therefore, the combined application of the underground tunnel excavation construction methods is urgently needed, the design scheme and the construction technical research for flexibly solving the problems that the shield firstly passes through and the tunnel segment is broken in the later period are needed.
Disclosure of Invention
The invention provides an air shaft duct for a mine construction zone for breaking shield tunnel segments and a method thereof, and aims to solve the technical problem that the air shaft duct for the construction zone for breaking shield segments is broken after a shield passes a station. The method is used for solving the technical problems that shield construction progress is restricted and the construction period of a node cannot be met due to the fact that shield station passing is carried out after the construction of the air duct of the air shaft is finished in the prior art, and can be used as a construction method when a temporary air shaft or an interval substation is additionally arranged after a shield interval passes through.
The technical scheme of the invention is as follows:
a method for breaking an air shaft duct in a shield tunnel segment mine construction interval comprises the following steps:
the method comprises the following steps: transversely excavating an air shaft duct at one side of the existing shield tunnel;
firstly, grouting advanced deep holes to reinforce an air shaft air duct vault soil body 101, then excavating the air shaft air duct in layers and sections according to pilot tunnel numbers by using a step method, and constructing a primary support;
constructing and constructing a primary support from the top of the tunnel 3, transversely crossing the existing tunnel, excavating to the end wall plug of the air duct of the air shaft, constructing an end wall A, and excavating into an underground layer 1; constructing a lower-layer pilot tunnel from the top of the tunnel, constructing primary support, transversely excavating to the outer edge of the adjacent shield tunnel for plugging, constructing a second end wall B, and excavating into a second underground layer 2;
step two: constructing a waterproof layer and a secondary lining structure of an air duct of the air shaft;
constructing waterproof layers and two lining structures on the outer side 4 of the underground first-layer rail row area of the air duct of the air shaft, the outer side 6 of the underground first-layer rail row area and the outer side 5 of the underground second-layer rail row area, and reserving underground second-layer side walls of the rail row area without constructing the waterproof layers and the two lining structures; reserving a No. 1 vertical shaft hole 10 and a No. 2 vertical shaft hole 12 on a middle plate of an underground one-layer rail area 6, and reserving a left line tunnel vault hoisting port 9 and a right line tunnel vault hoisting port 11 which are also used as permanent piston wind holes respectively; the No. 1 vertical shaft is positioned between the left tunnel and the right tunnel, and the No. 2 vertical shaft is positioned on the side edge of the right tunnel; the left line tunnel vault hoisting port 9 and the right line tunnel vault hoisting port 11 are positioned at the tops of the left line tunnel and the right line tunnel;
step three: digging No. 1 and No. 2 vertical shafts in an air duct of the air shaft:
the temporary inverted arch of the upper guide tunnel in the air duct of the air shaft in the range of the opening of the No. 1 vertical shaft and the No. 2 vertical shaft is broken in a blocking manner, and the vertical shaft is excavated by hanging a well wall upside down;
step four: constructing a second substrate plate 14 and partial side walls of the air shaft air duct in the No. 1 and No. 2 vertical shafts, wherein the second substrate plate and the partial side walls of the air shaft air duct comprise the upper parts 15 of the side walls in the width direction of the air shaft air duct and the upper parts 121 of the outer side walls of the No. 2 vertical shafts, which are far away from the tunnel;
step five: removing shield segments in the air duct of the air shaft;
after the second lining construction of the No. 1 vertical shaft and the No. 2 vertical shaft in the air duct of the air shaft is finished, firstly, removing tunnel pipe pieces between left line areas, constructing a movable steel ring support 18 on a first ring pipe piece to be removed, and firstly, removing the first ring pipe piece in the middle; moving the movable steel ring support to the next ring of pre-removed pipe pieces, symmetrically and gradually removing the pipe pieces on two sides of the first ring of pipe pieces until reaching the side wall 8 of the air duct of the air shaft; the end wall II B and the primary support of the side wall of the vertical shaft are gradually broken along with the pipe sheet of the left line tunnel, and the left line tunnel is communicated with the air duct of the air shaft and the No. 1 vertical shaft;
step six: constructing a secondary lining structure of the air duct of the air shaft in the segment-broken range;
(1) hanging double-layer reinforcing mesh sheets, spraying C20 concrete to close an air soil body 19 on the outer side of the side wall of the air shaft air duct, excavating a soil body at the bottom of the removed segment to a structural bottom plate, and sealing the bottom 20 by adopting C20 sprayed concrete and I22 a steel support;
(2) constructing a waterproof layer of a bottom plate, binding reinforcing steel bars, erecting a scaffold in the segment-broken range, erecting a formwork, pouring a secondary lining structure of the bottom plate (in an air-facing soil body 19 and a back cover 20), and constructing and finishing a side wall structure (8) of an air duct of the air shaft and a post-cast ring beam 21;
and after the left line pipe piece is removed, removing the tunnel pipe piece between the right line areas according to the same method, constructing a secondary lining structure of the air shaft air channel in the range of the removed pipe piece, and realizing the communication between the air shaft air channel and the left line, the right line tunnel, the No. 1 vertical shaft and the No. 2 vertical shaft.
The method for breaking the air shaft duct in the shield tunnel segment mine construction interval is characterized in that,
the method comprises the following steps that firstly, the air shaft air duct is arranged into four layers of 12 pilot tunnel air ducts, all chambers are excavated and preliminary supports are constructed according to the pilot tunnel numbering step method, the step length is 3-5 m, locking anchor pipes are constructed in time, and the longitudinal excavation length of each chamber is staggered by not less than 6 m; the upper two layers of pilot tunnels (No. 1-6 chambers) are excavated to the end wall for plugging by crossing the existing tunnel, and then the end wall A is constructed; constructing a lower layer of pilot tunnel (No. 7-12) to the outer edge of the adjacent shield tunnel for plugging, and constructing an end wall B;
when the vertical shaft is excavated in the third step, the temporary inverted arches of the upper pilot tunnel in the air duct of the air shaft (No. 2, No. 4 and No. 6) in the range of the opening of the vertical shaft No. 1 and the vertical shaft No. 2 are broken in blocks, the vertical shaft grating is erected in time, the longitudinal tie bars are connected, and the section steel support is erected; the vertical excavation step distance is the grid distance, and the section steel supports the vertical distance concrete grid distance; excavating to the bottom of the vertical shaft, and sealing the bottom in time; constructing according to the construction sequence of the No. 1 vertical shaft and the No. 2 vertical shaft, and carrying out deep hole grouting reinforcement on two sides of the vertical shaft in time in the vertical shaft construction process;
when constructing the two substrate plates and part of the air shaft air duct side wall in the shaft, dismantling two lower section steel supports in the shaft, laying a waterproof layer, binding reinforcing steel bars, and pouring the two substrate plates 14 and the lower part of the side wall; and after the second lining of the bottom plate is poured to reach 80% of the design strength, erecting a scaffold, locally breaking a temporary intermediate wall of the vertical shaft, laying a waterproof layer, binding reinforcing steel bars, and erecting a formwork to pour the upper part 121 of the outer side wall and connect the outer side wall with the intermediate floor, and the upper part 15 of the side wall in the width direction of the air duct of the air shaft.
The method for breaking the air shaft duct in the shield tunnel segment mine construction interval comprises the following steps of:
(1) construction preparation:
firstly, erecting a steel frame on a middle plate of an air duct of the air shaft, laying 2I 32a steel beams 22 on a left tunnel vault hoisting port 9 and a right tunnel vault hoisting port 11 respectively, and fixing 2 chain blocks of 10t on different steel beams respectively so as to facilitate the hoisting and outward transportation of duct pieces and materials;
assembling the movable steel ring supports 18; the movable steel ring supports are assembled at the positions of the segments to be dismantled, the jacks which are radially and symmetrically distributed in a hydraulic support system of the movable steel ring supports can provide support stress for the segments for dismantling the connecting bolts in the early stage, and the jacks which work independently can provide operation space for the segments to be dismantled through unloading hydraulic rods and provide continuous support stress for the segments to be dismantled in the later stage when the segments are dismantled, so that the overall stability of the segments to be dismantled of the dismantling rings is ensured;
(2) the duct piece removing method comprises the following specific steps:
firstly, removing a middle segment, namely removing a segment 1, erecting a movable steel support to the segment 1, and providing support stress for the segment through a hydraulic loading system of the movable steel support;
secondly, perforating a grouting hole of the duct piece at the vault position, installing a duct piece hoisting bolt on the grouting hole of the duct piece to be dismantled, and installing the bolt on a lifting rope of a chain block; completely removing the longitudinal connecting bolts above the center line of the segment between the ring 1 and the rings 2 and 3 on the two sides;
cutting a 1 st ring wedge-shaped K segment of the vault by using a water drill or a wire saw, making a circle of cutting seams around the K segment, removing the longitudinal jacking force of the segment to separate the segment from the peripheral segment, and removing the K segment; in the dismantling process, the movable steel supports are gradually unloaded by jacks at two sides of the K blocks, the lifting ropes of the chain block are slowly tensioned, and the chain block is transported to the outside of the hole through a reserved lifting hole of the air shaft air duct;
fourthly, removing adjacent block pipe pieces, installing pipe piece hoisting bolts in the pipe piece bolt holes to be removed, and removing the bolts connected with the adjacent block pipe pieces; slowly tensioning the chain block, symmetrically and sectionally unloading the hydraulic jack of the movable steel support, and lifting out the pipe piece; removing the pipe piece within 180-degree arch top of the 1 st ring pipe piece;
fifthly, symmetrically disassembling the ring by ring according to the sequence numbers from two sides of the No. 1 ring pipe piece by adopting the same method; removing the pipe piece within the range of 180-degree vault of each ring pipe piece, erecting a movable supporting steel ring on the pipe piece before removing, and moving the steel ring to the next ring to remove the pipe piece in advance after the removal of the pipe piece is finished;
cutting the pipe piece in the 180-degree range of the bottom of the pipe piece into small pieces by using a water drill or a wire saw, and removing the cut and crushed pipe piece by using an excavator.
The method for breaking the air shaft duct in the shield tunnel segment mining construction interval comprises the following reinforcing steps before excavation:
(1) before the air duct is excavated, longitudinal connecting bolts of permanent duct pieces and duct pieces to be removed are removed, steel ring inner supports 16 with the outer diameter equal to the inner diameter of the duct pieces are erected on 10 ring duct pieces in the shield tunnel and on two sides of the air duct of the air shaft, and the steel rings are connected through 25b type steel longitudinal connecting beams 17 to prevent the duct pieces from deforming and increasing in the construction process;
(a) the steel rings are spliced and connected by arc-shaped steel plates, and are provided with two I-shaped steel vertical supports 23 which are spliced by a worker 40b at intervals of 2000 mm; three workers 25b are arranged to double-splice transverse I-steel supports 24, and the first distance is 1300mm from the top.
b) Four I25 b type steel longitudinal connecting beams 17 are arranged at the upper, lower, left and right cross centers of the steel rings for longitudinal connection.
(2) Before the steel ring inner support is erected, a duct piece dismantling section is radially grouted and reinforced in a tunnel through duct pieces (duct piece grouting holes are added);
each 4 rings of permanent section of jurisdiction of wind shaft wind channel both sides are consolidated from the slip casting in the tunnel, consolidate the peripheral stratum of section of jurisdiction, and radial slip casting length is 2m, and 7 injected holes are beaten to establish in every ring pipe sheet upper portion, 4 injected holes are beaten to establish in the lower part. The grouting slurry adopts single-liquid cement slurry, and during grouting operation, the grouting pressure and flow change conditions are observed, and grouting parameters are strictly controlled;
(3) auxiliary grouting reinforcement in vertical shaft and air duct pilot tunnel
Before the duct piece is removed, the peripheral soil mass of 4 adjacent ring duct pieces at two ends of the secondary lining of the air shaft air duct is grouted and reinforced,
near the transverse pilot tunnel, grouting holes are drilled at the primary support of the lower pilot tunnel of the air duct of the air shaft for reinforcement, the horizontal spacing of the grouting holes is 1m, the vertical spacing of the grouting holes is 1m, the grouting holes are arranged in a quincunx manner, and the drilling length is 4 m; when primary support is applied in the vertical shaft near the vertical shaft, grouting holes are horizontally punched for reinforcement, the horizontal spacing of the grouting holes is 1m, the vertical spacing of the grouting holes is 1m, the grouting holes are arranged in a quincunx manner, and the punching length is 4 m; the grout adopts single-liquid grout, grouting parameters are strictly controlled in the grouting process, the radius diffusion range of the grout reaches 0.5m, and the grout can be effectively lapped between grouting holes.
The invention relates to an interval air shaft air duct for breaking shield tunnel segment mine method construction, which comprises an existing tunnel, wherein the existing tunnel comprises a left line tunnel and a right line tunnel, and is characterized by further comprising an underground one layer 1 and an underground two layer 2 of the air shaft air duct constructed by a pilot tunnel step method; the underground layer transversely spans two existing tunnels from the top of the left tunnel and the top of the right tunnel and is constructed for primary support till the end wall of the air duct of the air shaft is plugged, and a first end wall A is arranged; the second underground layer is transversely plugged to the outer edge of the adjacent shield tunnel from the position below the top of the tunnel, and is provided with a second end wall B for primary support construction; a No. 1 vertical shaft is arranged between the left and right line tunnels, a No. 2 vertical shaft is arranged on the outer side edge of the tunnel far away from the end wall II B, and primary support is constructed; a No. 1 vertical shaft hole 10 and a No. 2 vertical shaft hole 12 are formed in the middle partition plate of the underground layer 1; in the range of the air duct of the air shaft, the primary support of the end wall II B, the left linear tunnel segment, the primary support of the No. 1 vertical shaft side wall, the primary support of the right linear tunnel segment and the primary support of the No. 2 vertical shaft side wall are synchronously removed, so that the air duct of the air shaft is communicated with the left linear tunnel, the right linear tunnel, the No. 1 vertical shaft and the No. 2 vertical shaft.
A break interval air shaft wind channel of shield tunnel section of jurisdiction mine method construction, its characterized in that, underground one deck 1, two layers of 2, left side line tunnel section of jurisdiction and right side line tunnel section of jurisdiction broken scope, No. 1 shaft, No. 2 shaft set up two lining structures.
The invention has the technical characteristics that: after the upper-layer pilot tunnel of the air duct crosses over the shield tunnel, primary support and secondary support structures on two sides of the shield are hung upside down under the protection of primary support and secondary support of the upper-layer air duct, then primary support structures on the side wall of the vertical shaft are broken, segments of the shield are broken, and finally pouring of the secondary support structures of the air duct is completed.
Effects of the invention
Through the combined application of several underground excavation methods, the contradiction between the construction lag of the air duct of the air shaft and the restricted construction progress of the shield is effectively solved, meanwhile, the risk of starting and receiving the shield for multiple times when the shield passes through the air duct of the air shaft can be avoided, and the method has the advantages of reasonable working procedures, safety, reliability, capability of effectively shortening the construction period and the like. Meanwhile, the method for constructing the air shaft air duct can solve the problem that the shield passes through in advance and then breaks away tunnel segments and can be applied to projects of adding stations, reducing stations, building stations slowly and needing temporary air shafts and the like.
Drawings
FIG. 1 is a schematic view of the air shaft duct branch pilot tunnel excavation lateral direction of the present invention,
fig. 2(1), 2(2) are longitudinal views illustrating the excavation of the air shaft duct branch pilot tunnel of the present invention, and fig. 2(2) is a cross-sectional view illustrating fig. 2(1) 1-1;
FIGS. 3(1) and (2) are schematic views of a structure of a second liner for underground second-layer construction of a subsurface layer of an air duct of the air shaft of the invention, and FIG. 3(2) is a sectional view of FIG. 3(1) 1-1;
fig. 4(1) and (2) are schematic diagrams of the construction of the No. 1 vertical shaft and the No. 2 vertical shaft of the air duct of the air shaft of the invention, and fig. 4(2) is
FIG. 4(1) section view through 1-1;
fig. 5(1) and (2) are schematic diagrams of construction second linings of the air shaft duct No. 1 and No. 2 shafts of the invention, and fig. 5(2) is a sectional view of fig. 5(1) 1-1;
FIG. 6 is a schematic view of shield segment removal construction of an air shaft duct according to the present invention,
FIG. 7 is a schematic diagram of the construction of the outer side wall side soil body and the back cover after the shield segments are removed from the air shaft duct of the present invention,
FIG. 8 is a schematic view of a construction of a secondary lining structure after shield segments are removed from an air shaft duct according to the present invention,
figure 9 is a flow chart of the specific operation steps of the present invention for segment removal,
FIG. 10 is a schematic view of the arrangement of plate openings and the arrangement of structural steel beams in the air duct of the air shaft of the present invention,
figure 11 is a schematic view of the segment lifting of the present invention,
figure 12 is a schematic view of the inner support of the steel ring of the present invention,
figure 13 is a schematic view of the grouting reinforcement in the shield tunnel of the invention,
figure 14 is a schematic cross-sectional view of the auxiliary grouting in the shaft of the invention,
fig. 15 is a schematic plan view of the auxiliary grouting in the shaft of the present invention;
FIG. 16 is a schematic view of an air shaft in elevation according to the present invention;
description of the figure numbering:
underground one-layer 1, underground two-layer 2, tunnel 3, underground one-layer rail area outer side 4, underground two-layer rail area outer side 5, underground one-layer rail area 6, rail area underground two-layer bottom plate 7, air shaft air duct side wall 8, left tunnel vault hoisting port 9, No. 1 vertical shaft hole 10, right tunnel vault hoisting port 11 with permanent piston air hole, No. 2 vertical shaft hole 12, outer side wall upper part 121, scaffold 13, two backing plates 14, side wall upper part 15, steel ring inner support 16, I25 b section steel longitudinal connecting beam 17, movable steel ring support 18, air shaft air duct outer side wall adjacent hollow soil body 19, bottom sealing 20, ring beam 21, I32a type steel beam 22, vertical support 23, transverse support 24, middle first ring segment, second ring segment, third ring segment, fourth ring segment, fifth ring segment, sixth ring segment, seventh ring segment, eighth ring segment, A ninth ring segment ninthly;
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings.
The invention relates to a method for breaking an air shaft duct in a shield tunnel segment mine construction interval, which mainly comprises the following steps:
(1) grouting advanced deep holes to reinforce the vault soil body 101 of the air shaft air duct, and excavating the air shaft air duct in a layered and segmented manner according to the section size and the engineering conditions of the air shaft air duct after a reinforcing effect is achieved;
as shown in fig. 1, the following description will be made in detail by taking four layers of 12-layer pilot tunnel construction air shaft ducts as an example, excavating all chambers and constructing primary supports in sequence by a pilot tunnel numbering step method, wherein the step length is 3-5 m, locking anchor pipes are constructed in time, and the longitudinal excavation lengths of all chambers are staggered by no less than 6 m;
as shown in fig. 2, (1) and (2), the upper two layers of pilot tunnels (No. 1-6 chambers) are constructed and constructed for primary support from the top of the tunnel 3, transversely span the existing tunnel, are excavated to the air shaft air duct end wall for plugging, are constructed as an end wall A, and are excavated into an underground layer 1; constructing a lower layer of pilot tunnels (No. 7-12) from the top of the tunnel, constructing primary supports, transversely excavating to the outer edge of the adjacent shield tunnel for plugging, constructing a second end wall B, and excavating into a second underground layer 2;
(2) as shown in fig. 3(1) (2), waterproof layers and two lining structures on the outer side 4 of the underground one-layer rail area of the air shaft air duct, the underground one-layer rail area 6 and the outer side 5 of the underground two-layer rail area are constructed, only structures of side walls of the underground two-layer rail area of the air shaft air duct and an underground two-layer bottom plate 7 of the rail area are reserved without construction, so that duct pieces are conveniently dismantled, a No. 1 vertical shaft hole 10 and a No. 2 vertical shaft hole 12 are reserved on a middle plate of the underground one-layer rail area 6, and a left-line tunnel vault lifting hole 9 and a right-line tunnel vault lifting hole 11 are reserved and are also used as permanent piston air holes; the No. 1 vertical shaft is positioned between the left tunnel and the right tunnel, and the No. 2 vertical shaft is positioned on the side edge of the right tunnel; the left line tunnel vault hoisting port 9 and the right line tunnel vault hoisting port 11 are positioned at the tops of the left line tunnel and the right line tunnel;
(3) as shown in fig. 4(1), (2); the temporary inverted arches of air shaft air ducts 2, 4 and 6 pilot tunnels in the opening ranges of the No. 1 vertical shaft and the No. 2 vertical shaft are broken in a partitioning mode, the vertical shaft is excavated by hanging a shaft wall upside down, vertical shaft grids are erected in time, longitudinal tie bars are connected, and profile steel supports are erected;
the vertical excavation step distance is a grid distance, a profile steel support vertical distance and a concrete grid distance; excavating to the bottom of the vertical shaft, and sealing the bottom in time; constructing according to the construction sequence of the No. 1 vertical shaft and the No. 2 vertical shaft, and carrying out deep hole grouting reinforcement on two sides of the vertical shaft in time in the vertical shaft construction process;
(4) dismantling two steel supports at the lower part in the shaft, laying a waterproof layer, binding reinforcing steel bars, and pouring two substrate plates 14 and partial side walls; after the second lining of the bottom plate reaches 80% of the design strength, erecting a scaffold, locally breaking a vertical shaft temporary intermediate wall, laying a waterproof layer, binding reinforcing steel bars, erecting a formwork, pouring the upper part 121 of the outer side wall and connecting the middle floor, and the upper part 15 of the side wall in the width direction of the air duct of the air shaft; as shown in fig. 5(1) and (2).
(V): removing shield segments in the air duct of the air shaft;
as shown in fig. 6, after the second lining construction of the No. 1 vertical shaft and the No. 2 vertical shaft in the air shaft duct is finished, firstly, tunnel pipe pieces between left line areas are dismantled, a movable steel ring support 18 is constructed on a first ring pipe piece which is dismantled in advance, and firstly, a first ring pipe piece in the middle is dismantled; moving the movable steel ring support to the next ring of pre-removed pipe pieces, symmetrically and gradually removing the pipe pieces on two sides of the first ring of pipe pieces until reaching the side wall 8 of the air duct of the air shaft; the end wall II B and the primary support of the side wall of the vertical shaft are gradually broken along with the pipe sheet of the left line tunnel, and the left line tunnel is communicated with the air duct of the air shaft and the No. 1 vertical shaft;
(VI): constructing a secondary lining structure of the air duct of the air shaft in the segment-broken range; as shown in figures 7 and 8 of the drawings,
(1) hanging double-layer reinforcing mesh sheets, spraying C20 concrete to close an air soil body 19 on the outer side of the side wall of the air shaft air duct, excavating a soil body at the bottom of the removed segment to a structural bottom plate, and sealing the bottom 20 by adopting C20 sprayed concrete and I22 a steel support;
(2) constructing a waterproof layer of a bottom plate, binding reinforcing steel bars, erecting a scaffold in the segment-broken range, erecting a formwork, pouring a secondary lining structure of the bottom plate (in an air-facing soil body 19 and a back cover 20), and constructing and finishing a side wall structure (8) of an air duct of the air shaft and a post-cast ring beam 21;
and after the left line pipe piece is removed, removing the tunnel pipe piece between the right line areas according to the same method, constructing a secondary lining structure of the air shaft air channel in the range of the removed pipe piece, and communicating the air shaft air channel with the left line tunnel, the right line tunnel, the No. 1 vertical shaft and the No. 2 vertical shaft to form the air shaft air channel. As shown in fig. 5 and 8. The bottom of the air duct of the air shaft, the shaft No. 1 and the bottom of the shaft No. 2 are deeper than the tunnel.
The specific embodiment of duct piece removal is as follows:
the removal of the tube sheets is mainly carried out in the following steps, see the flow chart of fig. 9.
(1) Construction preparation: as shown in fig. 10;
firstly, erecting a steel frame on a middle plate of an air duct of the air shaft, laying 2I 32a steel beams 22 on a left tunnel vault hoisting port 9 and a right tunnel vault hoisting port 11 respectively, and fixing 2 chain blocks of 10t on different steel beams respectively so as to facilitate the hoisting and outward transportation of duct pieces and materials;
assembling the movable steel ring support 18 as shown in FIG. 11; the movable steel ring is assembled at the position of the duct piece to be dismantled, the jacks which are radially and symmetrically distributed are arranged in a hydraulic support system of the movable steel ring, so that supporting stress can be provided for the duct piece for dismantling the connecting bolt in the early stage, and the jacks which independently work can provide operation space for the duct piece to be dismantled through unloading a hydraulic rod and provide continuous supporting stress for the duct piece to be dismantled in the later stage when the duct piece is dismantled, so that the overall stability of the duct piece to be dismantled of the dismantling ring is ensured;
(2) segment removal is shown with reference to figures 6, 9 and 11:
firstly, removing a middle segment, namely removing a segment 1, erecting a movable steel support to the segment 1, and providing support stress for the segment through a hydraulic loading system of the movable steel support;
secondly, perforating a grouting hole of the duct piece at the vault position, installing a duct piece hoisting bolt on the grouting hole of the duct piece to be dismantled, and installing the bolt on a lifting rope of a chain block; completely removing the longitudinal connecting bolts above the center line of the pipe piece between the ring 1 and the rings 2 and 3;
cutting a 1 st ring wedge-shaped K segment of the vault by using a water drill or a wire saw, making a circle of cutting seams around the K segment, removing the longitudinal jacking force of the segment to separate the segment from the peripheral segment, and removing the K segment; in the dismantling process, jacks on two sides of the movable steel support K block are gradually unloaded, a lifting rope of the chain block is slowly tensioned, and the chain block is transported to the outside of the hole through a reserved lifting hole of the air shaft air duct;
fourthly, removing adjacent block pipe pieces, installing pipe piece hoisting bolts in the pipe piece bolt holes to be removed, and removing the bolts connected with the adjacent block pipe pieces; slowly tensioning the chain block, symmetrically and sectionally unloading the hydraulic jack of the movable steel support, and lifting out the pipe piece; removing the pipe piece within 180-degree arch top of the 1 st ring pipe piece;
fifthly, the ring-by-ring is symmetrically removed from the two sides of the No. 1 ring pipe piece according to the serial number in the same way; removing the pipe piece within the range of 180-degree vault of each ring pipe piece, erecting a movable supporting steel ring on the pipe piece before removing, and moving the steel ring to the next ring to remove the pipe piece in advance after the removal of the pipe piece is finished;
cutting the pipe piece in the 180-degree range of the bottom of the pipe piece into small pieces by using a water drill or a wire saw, and removing the cut and crushed pipe piece by using an excavator;
the protective measures in the duct piece removing process are as follows:
(1) after the duct piece is removed, the arrangement state of the duct piece is broken, the duct piece is in a loosening state, and the permanent duct piece tends to deform and increase the ellipticity.
The concrete solving method is as follows: before the underground excavation air shaft air duct is excavated, longitudinal connecting bolts of permanent duct pieces and duct pieces to be dismantled are dismantled, steel ring inner supports 16 with the outer diameters being tightly attached to the inner diameters of the duct pieces are erected in 10 ring duct pieces on two sides of a piston air duct in a shield tunnel, and as shown in figure 12, 25b type steel longitudinal connecting beams 17 are adopted to tension and connect the steel rings so as to prevent the duct pieces from being deformed and increased in the construction process.
(a) The steel ring inner support (prior art) is formed by assembling small arc blocks, wood wedges or concrete blocks are placed on the inner side of joints, and M5.8-grade phi 24 bolts are adopted to rotate and jack up the wood wedges or the concrete blocks.
(b) Two I-shaped steel vertical supports 23 which are spliced by a worker 40b in a double mode are arranged in the steel ring in an inner supporting mode, and the distance is 2000 mm; three workers 25b are arranged to double-splice transverse I-steel supports 24, and the first distance is 1300mm from the top.
(c) Four I25 b type steel longitudinal connecting beams 17 are arranged at the upper, lower, left and right cross centers of the steel rings and are tensioned through the long type steel for longitudinal connection.
(d) Reliable welding is needed between the steel supports, and the height of the welding seam is not less than 8 mm. See fig. 1, 2;
(2) referring to fig. 13, 14 and 15, before the air shaft duct is excavated, the duct piece removing section passes through duct pieces from the tunnel (adding duct piece grouting holes for radial grouting reinforcement;
and 4 rings of permanent pipe pieces on two sides of the air duct of the air shaft are reinforced by grouting in the tunnel, the peripheral stratum of the pipe pieces is reinforced, the length of radial grouting is 2m, 7 grouting holes are drilled in the upper part of each ring of pipe pieces, 4 grouting holes are drilled in the lower part of each ring of pipe pieces, and different grouting points are selected for odd-numbered rings and even-numbered rings so as to ensure that each ring of grouting holes are in the same plane. The grouting slurry adopts single-liquid cement slurry, and during grouting operation, the grouting pressure and flow change conditions are observed, and grouting parameters are strictly controlled.
(3) Auxiliary grouting reinforcement in the vertical shaft and air duct pilot tunnel is shown in fig. 15 and 16;
before the duct piece is removed, the peripheral soil mass of 4 adjacent ring duct pieces at two ends of the secondary lining of the air shaft air duct is grouted and reinforced,
near the transverse pilot tunnel, grouting holes are drilled at the lower layer of the pilot tunnel of the air duct of the air shaft for reinforcement, the horizontal spacing of the grouting holes is 1m, the vertical spacing of the grouting holes is 1m, the grouting holes are arranged in a quincunx manner, and the drilling length is 4 m. And (3) when the vertical shaft is close to and is used for primary support in the vertical shaft, grouting holes are horizontally arranged for reinforcement, the horizontal spacing of the grouting holes is 1m, the vertical spacing of the grouting holes is 1m, the grouting holes are arranged in a quincunx manner, and the grouting length is 4 m. The grout adopts single-liquid grout, grouting parameters are strictly controlled in the grouting process, the radius diffusion range of the grout reaches 0.5m, and the grout can be effectively lapped between grouting holes.
Referring to fig. 16, the sectional air shaft duct for breaking shield tunnel segment mine method construction obtained by the above method includes an existing tunnel, the existing tunnel includes a left-line tunnel and a right-line tunnel, and further includes an underground layer 1 and an underground layer 2 of the air shaft duct constructed by a pilot tunnel step method; the underground layer transversely spans two existing tunnels from the top of the left tunnel and the top of the right tunnel and is constructed for primary support till the end wall of the air duct of the air shaft is plugged, and a first end wall A is arranged; the second underground layer is transversely plugged to the outer edge of the adjacent shield tunnel from the position below the top of the tunnel, and is provided with a second end wall B for primary support construction; a No. 1 vertical shaft 100 is arranged between the left and right line tunnels, a No. 2 vertical shaft 120 is arranged on the outer side edge of the tunnel far away from the end wall II B, and primary support is constructed; a No. 1 vertical shaft hole 10 and a No. 2 vertical shaft hole 12 are arranged on the middle partition board of the underground layer 1, and refer to fig. 5 (1); in the range of the air duct of the air shaft, the primary support of the end wall II B, the left linear tunnel segment, the primary support of the No. 1 vertical shaft side wall, the primary support of the right linear tunnel segment and the primary support of the No. 2 vertical shaft side wall are synchronously removed, so that the air duct of the air shaft is communicated with the left linear tunnel, the right linear tunnel, the No. 1 vertical shaft and the No. 2 vertical shaft.
A break interval air shaft wind channel of shield tunnel section of jurisdiction mine method construction, underground one deck 1, two layers of 2, left side line tunnel section of jurisdiction and right side line tunnel section of jurisdiction broken scope, No. 1 shaft, No. 2 shaft set up two lining structures.
Claims (6)
1. A method for breaking an air shaft duct in a shield tunnel segment mine construction interval is characterized by comprising the following steps:
the method comprises the following steps: transversely excavating an air shaft duct at one side of the existing shield tunnel;
firstly, grouting advanced deep holes to reinforce a vault soil body (101) of an air shaft air duct, then excavating the air shaft air duct in a layered and segmented manner according to pilot tunnel numbers by using a step method, and constructing a primary support;
constructing and constructing primary support from the top of the tunnel (3) by an upper-layer pilot tunnel, transversely crossing two existing tunnels, excavating to the end wall plug of the air duct of the air shaft, constructing an end wall A, and excavating into an underground layer (1); constructing a lower-layer pilot tunnel from the top of the tunnel to be initially supported, transversely excavating to the outer edge of the adjacent shield tunnel to be plugged, constructing a second end wall B, and excavating to form a second underground layer (2);
step two: constructing a waterproof layer and a secondary lining structure of an air duct of the air shaft;
constructing waterproof layers and secondary lining structures on the outer side (4) of the underground one-layer rail row area of the air duct of the air shaft, the underground one-layer rail row area (6) and the outer side (5) of the underground two-layer rail row area, and reserving the underground two-layer side wall of the rail row area without constructing the waterproof layers and the secondary lining structures; reserving a No. 1 vertical shaft hole (10) and a No. 2 vertical shaft hole (12) on a middle plate of an underground one-layer rail area (6), and reserving a left line tunnel vault hoisting port (9) and a right line tunnel vault hoisting port (11) which are also used as permanent piston wind holes respectively; the No. 1 vertical shaft is positioned between the left tunnel and the right tunnel, and the No. 2 vertical shaft is positioned on the side edge of the right tunnel; the left line tunnel vault hoisting port (9) and the right line tunnel vault hoisting port (11) are positioned at the tops of the left line tunnel and the right line tunnel;
step three: digging No. 1 and No. 2 vertical shafts in an air duct of the air shaft:
the temporary inverted arch of the upper guide tunnel in the air duct of the air shaft in the range of the opening of the No. 1 vertical shaft (100) and the No. 2 vertical shaft (120) is broken in a blocking way, and the vertical shaft is excavated by hanging a well wall upside down;
step four: constructing two backing plates (14) and partial side walls of the air shaft air duct in the No. 1 and No. 2 vertical shafts, wherein the side walls comprise the upper parts (15) of the side walls in the width direction of the air shaft air duct and the upper parts (121) of the outer side walls of the No. 2 vertical shafts, which are far away from the tunnel;
step five: removing shield segments in the air duct of the air shaft;
after the second lining construction of the No. 1 vertical shaft and the No. 2 vertical shaft in the air duct of the air shaft is finished, firstly, tunnel pipe pieces between left line areas are dismantled, a movable steel ring support (18) is constructed on a first ring pipe piece to be dismantled, and firstly, the first ring pipe piece in the middle is dismantled; moving the movable steel ring support to the next ring of pre-removed pipe pieces, symmetrically and gradually removing the pipe pieces on two sides of the first ring of pipe pieces until reaching the side wall (8) of the air duct of the air shaft; the end wall II B and the primary support of the side wall of the vertical shaft are gradually broken along with the pipe sheet of the left line tunnel, and the left line tunnel is communicated with the air duct of the air shaft and the No. 1 vertical shaft;
step six: constructing a secondary lining structure of the air duct of the air shaft in the segment-broken range;
(1) hanging double-layer reinforcing mesh sheets, spraying C20 concrete to close an air soil body (19) on the outer side of the side wall of the air shaft air duct, excavating a soil body with the bottom of the removed segment to a structural bottom plate, and sealing the bottom (20) by adopting C20 sprayed concrete and I22 a steel support;
(2) constructing a waterproof layer of a bottom plate, binding reinforcing steel bars, erecting a scaffold in the segment-broken range, erecting a formwork, pouring a secondary lining structure of the bottom plate (in an air-facing soil body 19 and a back cover 20), and constructing and finishing a side wall structure (8) of an air duct of the air shaft and a post-cast ring beam (21);
and after the left line pipe piece is removed, removing the tunnel pipe piece between the right line areas according to the same method, constructing a secondary lining structure of the air shaft air channel in the range of the removed pipe piece, and realizing the communication between the air shaft air channel and the left line, the right line tunnel, the No. 1 vertical shaft and the No. 2 vertical shaft.
2. The method for breaking the air shaft duct in the shield tunnel segment mine construction area according to claim 1,
the method comprises the following steps that firstly, the air shaft air duct is arranged into four layers of 12 pilot tunnel air ducts, all chambers are excavated and preliminary supports are constructed according to the pilot tunnel numbering step method, the step length is 3-5 m, locking anchor pipes are constructed in time, and the longitudinal excavation length of each chamber is staggered by not less than 6 m; the upper two layers of pilot tunnels (No. 1-6 chambers) span the existing tunnel and are excavated to the end wall for plugging, and then the end wall A is constructed; constructing a lower layer of pilot tunnels (No. 7-12) to the outer edge of the adjacent shield tunnel for plugging, and constructing an end wall B;
when the vertical shaft is excavated in the third step, the temporary inverted arches of the upper pilot tunnel in the air duct of the air shaft (No. 2, No. 4 and No. 6) in the range of the opening of the vertical shaft No. 1 and the vertical shaft No. 2 are broken in blocks, the vertical shaft grating is erected in time, the longitudinal tie bars are connected, and the section steel support is erected; the vertical excavation step distance is a grid distance, and the section steel supports the vertical distance and the concrete grid distance; excavating to the bottom of the vertical shaft, and sealing the bottom in time; constructing according to the construction sequence of the No. 1 vertical shaft and the No. 2 vertical shaft, and carrying out deep hole grouting reinforcement on two sides of the vertical shaft in time in the vertical shaft construction process;
when constructing the two substrate plates and part of the air duct side wall of the air shaft in the shaft, dismantling two lower section steel supports in the shaft, laying a waterproof layer, binding reinforcing steel bars, and pouring the two substrate plates (14) and the lower part of the side wall; and after the second lining of the bottom plate is poured to reach 80% of the designed strength, a scaffold is erected, the temporary intermediate wall of the vertical shaft is locally broken, a waterproof layer, binding reinforcing steel bars and a formwork are laid, the upper part (121) of the outer side wall is poured and connected with the middle floor slab, and the upper part (15) of the side wall in the width direction of the air duct of the air shaft is arranged.
3. The method for breaking the air shaft duct in the shield tunnel segment mine construction interval according to claim 1, wherein the fifth segment removal step further comprises the following steps:
(1) construction preparation:
firstly, erecting a steel frame on a middle plate of an air duct of an air shaft, laying 2I 32a steel beams (22) on a left tunnel vault hoisting port (9) and a right tunnel vault hoisting port (11) respectively, and fixing 2 chain blocks of 10t on different steel beams respectively so as to facilitate the hoisting and outward transportation of duct pieces and materials;
assembling the movable steel ring supports (18); the movable steel ring supports are assembled at the positions of the segments to be dismantled, the jacks which are radially and symmetrically distributed in a hydraulic support system of the movable steel ring supports can provide support stress for the segments for dismantling the connecting bolts in the early stage, and the jacks which work independently can provide operation space for the segments to be dismantled through unloading hydraulic rods and provide continuous support stress for the segments to be dismantled in the later stage when the segments are dismantled, so that the overall stability of the segments to be dismantled of the dismantling rings is ensured;
(2) the duct piece removing method comprises the following specific steps:
firstly, removing a middle segment, namely removing a segment 1, erecting a movable steel support to the segment 1, and providing support stress for the segment through a hydraulic loading system of the movable steel support;
secondly, perforating a grouting hole of the duct piece at the vault position, installing a duct piece hoisting bolt on the grouting hole of the duct piece to be dismantled, and installing the bolt on a lifting rope of a chain block; completely removing the longitudinal connecting bolts above the center line of the segment between the ring 1 and the rings 2 and 3 on the two sides;
cutting a 1 st ring wedge-shaped K segment of the vault by using a water drill or a wire saw, making a circle of cutting seams around the K segment, removing the longitudinal jacking force of the segment to separate the segment from the peripheral segment, and removing the K segment; in the dismantling process, the movable steel supports are gradually unloaded by jacks at two sides of the K blocks, the lifting ropes of the chain block are slowly tensioned, and the chain block is transported to the outside of the hole through a reserved lifting hole of the air shaft air duct;
fourthly, removing adjacent block pipe pieces, installing pipe piece hoisting bolts in the pipe piece bolt holes to be removed, and removing the bolts connected with the adjacent block pipe pieces; slowly tensioning the chain block, symmetrically and sectionally unloading the hydraulic jack of the movable steel support, and lifting out the pipe piece; removing the pipe piece within 180-degree arch top of the 1 st ring pipe piece;
fifthly, symmetrically disassembling the ring by ring according to the sequence numbers from two sides of the No. 1 ring pipe piece by adopting the same method; removing the pipe piece within the range of 180-degree vault of each ring pipe piece, erecting a movable supporting steel ring on the pipe piece before removing, and moving the steel ring to the next ring to remove the pipe piece in advance after the removal of the pipe piece is finished;
cutting the pipe piece in the 180-degree range of the bottom of the pipe piece into small pieces by using a water drill or a wire saw, and removing the cut and crushed pipe piece by using an excavator.
4. The method for breaking the air shaft duct in the shield tunnel segment mine construction interval according to claim 1, wherein the method for breaking the air shaft duct in the shield tunnel segment mine construction interval further comprises the following reinforcing steps before excavation:
(1) before the air duct is excavated, longitudinal connecting bolts of permanent duct pieces and duct pieces to be removed are removed, steel ring inner supports (16) with the outer diameter being equal to the inner diameter of the duct pieces are erected on 10 ring duct pieces on two sides of an air shaft air duct in a shield tunnel, and the steel rings are connected through 25b type steel longitudinal connecting beams (17) to prevent the duct pieces from deforming and increasing in the construction process;
(a) the steel rings are spliced and connected by arc-shaped steel plates, and are provided with two I-shaped steel vertical supports (23) spliced by 40b, and the distance is 2000 mm; arranging three I-shaped steel transverse supports (24) which are formed by double splicing of 25b I-shaped steel, wherein the first distance is 1300mm from the top;
(b) four I25 b type steel longitudinal connecting beams (17) are arranged at the upper, lower, left and right cross centers of each steel ring to carry out longitudinal connection among the steel rings.
(2) Before the steel ring inner support is erected, a duct piece dismantling section is radially grouted and reinforced in a tunnel through duct pieces (duct piece grouting holes are added);
each 4 rings of permanent section of jurisdiction of wind shaft wind channel both sides are consolidated from the slip casting in the tunnel, consolidate the peripheral stratum of section of jurisdiction, and radial slip casting length is 2m, and 7 injected holes are beaten to establish in every ring pipe sheet upper portion, 4 injected holes are beaten to establish in the lower part. The grouting slurry adopts single-liquid cement slurry, and during grouting operation, the grouting pressure and flow change conditions are observed, and grouting parameters are strictly controlled;
(3) auxiliary grouting reinforcement in vertical shaft and air duct pilot tunnel
Before the duct piece is removed, the peripheral soil mass of 4 adjacent ring duct pieces at two ends of the secondary lining of the air shaft air duct is grouted and reinforced,
near the transverse pilot tunnel, grouting holes are drilled at the primary support of the lower pilot tunnel of the air duct of the air shaft for reinforcement, the horizontal spacing of the grouting holes is 1m, the vertical spacing of the grouting holes is 1m, the grouting holes are arranged in a quincunx manner, and the drilling length is 4 m; when primary support is applied in the vertical shaft near the vertical shaft, grouting holes are horizontally punched for reinforcement, the horizontal spacing of the grouting holes is 1m, the vertical spacing of the grouting holes is 1m, the grouting holes are arranged in a quincunx manner, and the punching length is 4 m; the grout adopts single-liquid grout, grouting parameters are strictly controlled in the grouting process, the radius diffusion range of the grout reaches 0.5m, and the grout can be effectively lapped between grouting holes.
5. An interval air shaft air duct for breaking shield tunnel segment mine method construction comprises an existing tunnel, wherein the existing tunnel comprises a left line tunnel and a right line tunnel, and is characterized by further comprising an underground one layer (1) and an underground two layer (2) of the air shaft air duct constructed by a pilot tunnel step method; the underground layer transversely spans two existing tunnels from the top of the left tunnel and the top of the right tunnel and is constructed for primary support till the end wall of the air duct of the air shaft is plugged, and a first end wall A is arranged; the second underground layer is transversely plugged to the outer edge of the adjacent shield tunnel from the position below the top of the tunnel, and is provided with a second end wall B for primary support construction; a No. 1 vertical shaft (100) is arranged between the left and right line tunnels, a No. 2 vertical shaft (120) is arranged on the outer side edge of the tunnel far away from the end wall II B, and primary support is constructed; a No. 1 vertical shaft hole (10) and a No. 2 vertical shaft hole (12) are formed in the middle partition plate of the underground layer (1); in the range of the air duct of the air shaft, the primary support of the end wall II B, the left linear tunnel segment, the primary support of the No. 1 vertical shaft side wall, the primary support of the right linear tunnel segment and the primary support of the No. 2 vertical shaft side wall are synchronously removed, so that the air duct of the air shaft is communicated with the left linear tunnel, the right linear tunnel, the No. 1 vertical shaft and the No. 2 vertical shaft.
6. The regional air shaft duct for the mine construction for breaking the shield tunnel segment according to claim 5, wherein the underground first floor (1), the underground second floor (2), the left-line tunnel segment and right-line tunnel segment breaking range, the No. 1 shaft and the No. 2 shaft are provided with two lining structures.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115387385A (en) * | 2022-10-08 | 2022-11-25 | 中建八局轨道交通建设有限公司 | Vertical storey-adding construction method for underground space engineering |
| CN116145729A (en) * | 2023-04-23 | 2023-05-23 | 北京城建设计发展集团股份有限公司 | Subway layered station structure in sea-land connection area and construction method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115387385A (en) * | 2022-10-08 | 2022-11-25 | 中建八局轨道交通建设有限公司 | Vertical storey-adding construction method for underground space engineering |
| CN116145729A (en) * | 2023-04-23 | 2023-05-23 | 北京城建设计发展集团股份有限公司 | Subway layered station structure in sea-land connection area and construction method thereof |
| CN116145729B (en) * | 2023-04-23 | 2023-07-28 | 北京城建设计发展集团股份有限公司 | Subway layered station structure in sea-land connection area and construction method thereof |
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